Copper extension Utrecht is a refurbished town apartment in a 19th century Utrecht neighborhood. The client wanted to create additional living area. It was the client’s wish that the extension at the back of the house should be uniquely and individually styled in contrast to the virtually identical facades at the front of the row houses. A single copper construction was created amidst the diversity of back facades with their richness of extensions. The copper was applied in folded horizontal lengths. Facade openings on the first floor and the balcony above can be completely closed off with hardwood shutters. In addition to the two-storey house extension, the interior was also completely rebuild. All rooms can be accessed from an open, spacious stairwell in the centre of the house.